Re: changing style of vertices for ShowGraph with Combinatorica

*To*: mathgroup at smc.vnet.net*Subject*: [mg86312] Re: [mg86270] changing style of vertices for ShowGraph with Combinatorica*From*: "J. McKenzie Alexander" <jalex at lse.ac.uk>*Date*: Sat, 8 Mar 2008 05:41:14 -0500 (EST)*References*: <200803070729.CAA19892@smc.vnet.net>

Take a look at GraphPlot, the graph rendering function that is built into the Mathematica kernel. I switched from using ShowGraph to GraphPlot after realising that it was (a) faster and (b) easier to customise. Here's what you want: GraphPlot[ Cycle[3], Method -> None, EdgeRenderingFunction -> ({Black, Line[#1]} &), VertexRenderingFunction -> ({EdgeForm[{Thickness[0.005], Red}], Yellow, Disk[#1, 0.04]} &) ] You need to specify Method->None, otherwise GraphPlot will override the specified positions of the vertices in the graph and use its own default vertex positioning algorithm. VertexRenderingFunction is what you need to define in order to customise the appearance of the vertices. I provided a definition of EdgeRenderingFunction just so that the edges are rendered in the same way as ShowGraph. Cheers, Jason -- J. McKenzie Alexander Department of Philosophy, Logic and Scientific Method London School of Economics and Political Science Houghton Street, London WC2A 2AE On 7 Mar 2008, at 07:29, Murray Eisenberg wrote: > With Mathematica 6, I can change the default style (medium black disk) > for rendering the vertices of a Combinatorica Graph like this: > > Needs["Combinatorica`"] > > g = Cycle[3]; > ShowGraph[g, VertexStyle -> Disk[Large], VertexColor -> Red] > > But how can I, for example, change the vertex style so it is, say, a > large yellow disk with a thick red boundary? Or even just change it > to > be a circle? I tried "obvious" things like the following, but they > cause errors: > > ShowGraph[g, VertexStyle -> Graphics[Circle[], ImageSize -> 20]] > > -- > Murray Eisenberg murray at math.umass.edu > Mathematics & Statistics Dept. > Lederle Graduate Research Tower phone 413 549-1020 (H) > University of Massachusetts 413 545-2859 (W) > 710 North Pleasant Street fax 413 545-1801 > Amherst, MA 01003-9305 > Please access the attached hyperlink for an important electronic communications disclaimer: http://www.lse.ac.uk/collections/secretariat/legal/disclaimer.htm

**References**:**changing style of vertices for ShowGraph with Combinatorica***From:*Murray Eisenberg <murray@math.umass.edu>